Furnace



H. A. COLE.

FURNACE.

APPLICATION FILED 050.29. 1919.

1,402,743, Patented Jan. 10, 1922.

* 2 SHEETS-SHEET I- H. A. CQLE.

FURNACE.

APPLICATION FILED DEC.29, 1919.

1 $102,743, Patented Jan. 10,1922.

' z SHEETS-SHEET 2.

Wm r w 7 umrsn STATES PATENT OFFICE.

amen a. coma, or cmoaeo, rumors, assrcnoir r0 com mniwrac'runmsi COMPANY, or GHICAGO, ILLINOIS, A CORPORATION.

FURNACE.

Specification of Letters Patent.

Patented Jan. 10, 1922.

To all whom it may concern:

Be it known that I, HUGH A. COLE, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which I declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

The invention has relation more particularly to furnaces designed for heating purposes, and the invention consists in the features of novelty hereinafter described, illustrated in the accom an in drawin s and particularly pointed out in'the claims at the end of the specification.

In the drawings Figure 1 is a view in central vertical section through a heating furnace embodying my invention;

Fig. 2 is a view inhorizontal section on line 2-2 of Fig. 1;

Fig. 3 is a detail view in front elevation, showing the swinging door and plate valve at the front of the flue for escape of products of combustion.

Fig. 4 is a detail perspective view of the hot blast pipe.

As shown, the familiar construction, comprising inner and outer walls A and A, a fire pot and combustion chamber B and a fine C for the escape ofproducts of combustion. The flue C leads from the front of the dome B abovethe combustion chamber B and connects with the-annular portion C of said fine, thls annular portion being formed ofan eXtena A of the furnace and, as shown, this open ing in the front plate A of the furnace is closed by a door D that is hinged. When the door D is opened accesscan be had to the line C, C for the purpose of cleaning the same.

The fire pot and combustion chamber are of the usual up-draft type and within the flue C through which the'products of combody of the furnace is of bustion pass from the chamber B is arranged a natural draft, air inlet pipe E for delivering a current of highly heated air into the upper portion of the combustion E. The threaded ends of the bolts F are furnished with retaining nuts f. The door D is provided with two openings, 'cl and d? and the front end of the hot blast pipe E is arranged opposite. the upper opening (Z of the door. By providing the plateeat the top of the air inlet pipe E with the slots 6 through which the bolts F pass, the hot blast pipe can be adjusted forwardly and backwardly so as to bring its front end into closerelation to the opening (Z in the door D. The inner end of the air inlet pipe E is formed with a downwardly turned portion 6 that extends into the top of the combus-' tion chamber B.

Upon the outer face of the door D is iv-- oted, as at 6Z3, a plate valve G having an opening 9 formed therein and adapted to be brought coincident with either of the open ings cl or (Rot the door D. The valve G is also providedwith a handle g whereby the valve may be conveniently turned. a V I From the foregoing description it will be seen thatwhen the opening 9 in the valve Gr coincides with the opening d in the door D air will be admitted to the air inlet pipe E and will be highly preheated before it is delivered into the combustion chamber B. So, also, when the opening g in the valve G is turned to coincide with the opening (Z in the door' D, the opening 03- in the door'will be iment of the invention) by locating the hot air pipe at the top of the flue C, this hot air pipe is subjected to the most intense heat of the products of combustion, so that the air admitted through the pipe E will be highly preheated and in most effective condition for aiding combustion within the combustion chamber B. The location of the hotair pipe E in the upper portion of the flue C also leaves the lower portion of the flue free and unobstructed to permit access to the flue for cleaning purposes. Preferably the hot air pipe E is braced by a web 6 located at the downwardly turned portion of the pipe E, this web serving to strengthen the pipe E and guard against its warping under the in tense heat to which it is exposed. By removably mounting the hot air pipe within the flue G, this pipe can be readily withdrawn, not only for replacement or repalr, but also to permit free access for the cleaning of the flue through which the products of combustion escape and which from time to time needs to be cleaned.

The precise details of construction above set forth may be varied without departure from the scope of the invention.

.l/Vhat I ,claim as new and desire to secure by Letters Patent is;

v 1. In a furnace, an outer casing, a heater therein comprising a fire-pot and combustion chamber, a heat radiating flue for the combustion products leading from the upper portionof said combustion chamber and having an extension projecting laterally to the outer casing, the latter having a cleanout opening opposite said extension to afford access to said flue, a hot air pipe extending horizontallythrough said extension and said flue and having a clown-turned inner end portion opening into the central'portion of said combustion chamber, an exteriorly operable valve for controlling the admission of air to said hot air pipe and a door for said clean-out opening adapted to be opened and closed independently of said pipe.

2. Ina furnace, an outer casing, a heater therein'com'prising a fire-pot and combustion chamber, a heat radiating flue leading from the upper portion of said combustion chamber and having an extension projecting laterally to the outer casing, the latter having a clean-out opening to afford access to said flue through said extension, a door for said opening, a hot air pipe supported'in said this independently of saiddoor, extending horizontally through the upper portions of said extension and of said flue and having adown-turned inner end portion opening into the central part of the combustion chamber, and an exteriorly operable 'valve for controlling the admission of air to the outer endof said pipe. Y

- 3.'A furnace ofthe character described, comprising a combustion chamber, a flue for the escape ofcombustion' products extending foom the upper portion of said chamber to the furnace wall, the latter being provided with a door to afford access to said flue, said door having an'air inlet opening, and a pipe supported within said flue independently of said door and adjustable in close relation with the air inlet opening therein, said pipe being arranged to deliver heated air into said combustion chamber.

4. A furnace of the character described, comprising a combustion chamber, a flue for the'escape of combustion products extending from the upper portion of said chamber to the furnace wall, and a pipe extending from the furnace wall through said flue and having its inner end opening into said combustion chamber, and a common valve mechanism arranged to control the admission of air either to the outer end of said pipe or directly to said flue.

5. A furnace of the character described, comprising a combustion chamber, a fine for the escape of products of combustion extending from the upper portion of said combustion chamber to the wall of the furnace, said furnace wall being provided opposite said flue with an opening for the admission of air and a hot air pipe arranged within and suspended from the top of said flue and adjustable to bring its outer end into close relation with said opening and the inner end ofsaid pipe communicating with said combustion chamber.

6. A furnace of the character described, comprising a combustion chamber, a flue for the products of combustion extending from the upper portion of said combustion chamber to the furnace wall, said furnace wall being provided opposite said flue with a door having two openings therein for the admis sion' of air, valve mechanism for controlling said openings and a hot air pipe arranged within said flue, the outer end of said pipe being adjacent one of said openings and the inner end of said pipe communicating with said combustion chamber, the other of said openings being arranged to admit air to said flue.

7. A furnace of the character described, comprising a combustion chamber, a flue for the products of combustion'extending from the upper portion of said combustion cham-' ber to the furnace wall, said furnace wall being provided opposite said flue with a door having'two openings therein for the admission of air, a single valve for controlling both of said openings, one of the latter being arranged to admit air to said flue and a hot air pipe arranged at the top of said flue, the outer end of said pipe being adjacent the other of said openings and the inner end of 7 said pipe communicating with said combustion chamber.

' 8. A furnace of the character described, comprising a combustion chamber, a horizontally disposed fine for the passage of products of combustion leading from the upper portion of the combustion chamber to the front wall of the furnace and passing thence to the back of the furnace, a door at the front of said flue provided with an opening therein and having valve mechanism for controlling said opening and a hot air pipe extending from the opening in said door through the upper part of said fine and having a downturned inner end opening into the upper portion of said combustion chamber. a

9. A furnace of the character described,

comprising a combustion chamber, a hori valve pivoted upon said door and having an opening adapted to register with the openings in the door, one of said openings being arranged to admit air to said flue, and a hot air pipe arranged in said flue and extending from the other air inlet opening in said door to the upper part of said combustion chamber.

10. A draft attachment for furnaces of the character described, comprising a cast metal elbow pipe having an integral bracing web extending between the sections forming the elbow, and an integral perforated supporting flange on one side of one of its sections.

11. A furnace ofthe character described, comprising a combustion chamber, a flue for the escape of combustion products extendsaid door and having a valve operable independently of said door for controlling the admission of air to its outer inlet end.

12. A furnace of the character described, comprising a combustion chamber, a flue for the escape of combustion products extending from the upper portion of said chamber to the furnace wall, and a pipe for delivering heated air into said combustion chamber extending inwardly through said flue, the furnace wall having a door provided with an opening for registering with the outer inlet end of said pipe and said door adapted to be opened independently of said pipe to afford access to said flue.

13. A furnace of the character described, comprising a combustion chamber, a flue for the escape of combustion products extending from the upper portion of said chamber to the furnace wall, a pipe for delivering heated air into said combustion chamberextending inwardly through said flue, the furnace wall having a door provided with an air inlet opening for said pipe and said door adapted to be opened independently of said pipe to afford access to said flue. and a valve mounted on said door for controlling the admission of air through said opening and said i e. i p p HUGH A. COLE. 

